Idea: if you mod a community on a lemmy.somewhere you should be able to migrate it to lemmy.elsewhere which would include all post & comment links being forwarded and subbed users having their subscription updated to reflect the new location.
I’m aware this would be a way down the road as user account migration alone is still not great but it would be a great feature for the fediverse to have to avoid centralisation and mod/server admin wars.
I made a tool that does this until we can get something baked into Lemmy itself: https://github.com/CMahaff/lasim
There are a handful of other options out there too if ya search for em. Mine backs up / copies subscriptions, blocks, and a handful of profile settings.